Unanswered: getChildren

Unanswered: getChildren

I was looking to see if there is a method that can pull back all the children of an element
I cannot see anything that does this at the moment
So from the html below I want to get all the divs under the wrapper div from something like this

Code:

Ext.get('wrapper').getChildren()

Can I /should I poke this into the Ext.Element prototype?
Is there any existing methods I can use to achieve this
I am kinda lost in between Ext,Ext.Element, Ext.DomQuery
Any help is much appreciated

Thanks for your help
I maybe should have explained that I was thinking that I may not know the tag name, the id or class so would want something that could return a composite element based on structure
and then I could chain other methods for example

What I am trying to achieve is port over a MooTools sliding tab extension in to ExtJs core
I have an early prototype how it works using MooTools at the moment on my site to give you an idea of what I am trying to do. I am at the moment trying to do write an extension for Ext Core

I was looking for the child sections to be configurable so it maybe divs,uls or even tables. It would be up to the user implementing the structure to decide what there html would be
The extension I hope to write would not care what tags/html that was used, but would just get all the children under the wrapper div. It would be flexible enough to accommodate any tags as long as they were children of the wrapper div
So when I called getChildren it could return all child elements

I understand what yourself and hendricd have all already posted but I am looking for some more flexibility and I was also hoping to pick up how to add methods to Ext.Element and therefore understand some more about the Core while I was at it